FVXX22 KWBC 280430
VOLCANIC ASH ADVISORY STATEMENT
ISSUED 0430 UTC 28 NOV 1999 BY THE WASHINGTON VAAC 
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SAN CRISTOBAL  99-008   NICARAGUA  12.7N 87.0W 
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BACKGROUND:      SAN CRISTOBAL  NICARAGUA  (1404-02)
                 SUMMIT HEIGHT 5725 FT  (1745 M)
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SOURCES OF INFORMATION: GOES-8 INFRARED AND MULTISPECTRAL
IMAGERY...1800 UTC AVIATION MODEL WIND FORECAST
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ERUPTION DETAILS: SATELLITE IMAGERY SUGGESTED A POSSIBLE SMALL
ERUPTION BEGINNING AROUND 1900 UTC.
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DETAILS OF ASH CLOUD: NO ASH CAN BE DETECTED IN GOES-8 INFRARED AND
MULTISPECTRAL SATELLITE IMAGERY THROUGH 28/0345 UTC. A FEW HOURS AGO
MID LEVEL WEATHER CLOUDS MOVED INTO THE AREA BUT EVEN BEFORE THESE
CLOUDS ARRIVED NO ASH COULD BE SEEN IN IMAGERY.  
   HOWEVER SINCE THE LOW LEVEL ASH WAS PREVIOUSLY SEEN ONLY IN
VISIBLE IMAGERY IT IS POSSIBLE THAT THIS ASH STILL EXISTS BUT CAN NO
LONGER BE SEEN AT NIGHT IN THE ABSENCE OF VISIBLE SATELLITE IMAGERY.
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TRAJECTORY: UPPER AIR PATTERNS SUGGEST THAT ANY ASH AT ABOUT FL070
WOULD MOVE TO THE SOUTHWEST AT ABOUT 20 KNOTS.
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REAL TIME SATELLITE IMAGERY ALONG WITH THIS AND OTHER VOLCANIC ASH
ADVISORY STATEMENTS OFTEN ACCOMPANIED BY A MAP DEPICTING ASH
LOCATION ARE AVAILABLE AT INTERNET URL ADDRESS  
www.ssd.noaa.gov/VAAC/washington.html
(all lower case except /VAAC/)
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OUTLOOK:  SEE LATEST SIGMETS.
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THIS WILL BE THE LAST MESSAGE ON THIS EVENT UNLESS NEW INFORMATION
IS RECEIVED.
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PLEASE REFER TO SIGMETS FOR CURRENT WARNINGS.
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